Subframe selector parameters for a ASI 294 Pro

[ballyhoo]

Hello,

I am learning to analyse my data using the sub-frame selector, but I am not certain that I have the correct parameters.  I use a ASI 294 Pro with a 85mm triplet, FL 560mm. 

Here are the specs for camera, and the current parameters (Attached).

THANK YOU SO MUCH!

Sensor: 4/3? SONY IMX294 CMOS
Diagonal: 23.2mm
Resolution: 11.7Mega Pixels 4144X2822
Pixel Size: 4.63µm
Bayer Pattern: RGGB
Shutter:Rolling shutter
Exposure Range: 32µs-2000s
ROI: Supported
Read Noise: 1.2e @39db gain
QE peak: TBD
Full well: 63.7ke
ADC:14bit
DDRIII Buffer: 256MB
Interface: USB3.0/USB2.0
Adaptor: M42X0.75
Protect window:AR window
Dimensions: 78mm Diameter
Weight: 410g
Back Focus Distance: 6.5mm
Cooling: Regulated Two Stage TEC
Delta T: 35°C-40°C below ambient
Camera Power consumption: 650mA at 5V
Cooler Power consumption: 12V at 3A Max
Working Temperature: -5°C—45°C
Storage Temperature: -20°C—60°C
Working Relative Humidity: 20%—80%
Storage Relative Humidity: 20%—95%
Max FPS at full resolution:
10Bit ADC
4144×2822 19fps
14bit ADC
4144×2822 16fps

Resolution USB 3.0 Raw16
4144×2822 16.3fps
4096×2160 21.1fps
3840×2160 21.1fps
1920×1080 40.9fps
1280×720 59.7fps
640×480 85.9fps
320×240 153.4fps

Resolution USB 3.0 Raw8& HighSpeed
4144×2822 19.0fps
4096×2160 24.7fps
3840×2160 24.7fps
1920×1080 47.9fps
1280×720 69.8fps
640×480 100.5fps
320×240 179.3fps

[VoidPointer]

With a pixel-size of  4.63µm and FL=560mm you end up 1.71 arcsec/pixel (arcsec_per_pixelpixel = pixel_size[µm]/FL[mm] * 206.3) [1].
The electrons/DataNumber value depends on the gain setting of your camera. A setting of 117 corresponds to "unity gain" on the ASI294 and for that you would put in 1 electron/data number. Refer to your camera manual [2] (page 8 ) .

[1] http://www.wilmslowastro.com/software/formulae.htm
[2] https://astronomy-imaging-camera.com/manuals/ASI294%20Manual%20EN.pdf

HTH
Lars

[bulrichl]

With my ASI294MC Pro I measured a gain of 0.88 e/ADU at a gain setting of 120. So there was some deviation from the values published by ZWO.

It is correct to set 'Camera resolution' to 14-bit [0, 16383]. SubframeSelector takes into account that the camera driver scales the intensities (multiplying them by factor 4).

Bernd